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CS51413EDR8 参数 Datasheet PDF下载

CS51413EDR8图片预览
型号: CS51413EDR8
PDF下载: 下载PDF文件 查看货源
内容描述: [Switching Regulator, Current/voltage-mode, 4A, 594kHz Switching Freq-Max, PDSO8, 0.150 INCH, SO-8]
分类和应用: 开关光电二极管
文件页数/大小: 16 页 / 137 K
品牌: CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
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Package Pin Description  
PACKAGE PIN #  
PIN SYMBOL  
FUNCTION  
1
BOOST  
The BOOST pin provides additional drive voltage to the on-chip NPN  
power transistor. The resulting decrease in switch on voltage increases  
efficiency.  
2
3
VIN  
This pin is the main power input to the IC.  
VSW  
This is the connection to the emitter of the on-chip NPN power transistor  
and serves as the switch output to the inductor. This pin may be subject-  
ed to negative voltages during switch off-time. A catch diode is required  
to clamp the pin voltage in normal operation.This node can stand 1.0V  
for less than 50ns during switch node flyback.  
4 (CS51412/ 14)  
5 (CS51411/ 13)  
BIAS  
The BIAS pin connects to the on-chip power rail and allows the IC to  
run most of its internal circuitry from the regulated output or another  
low voltage supply to improve efficiency. The BIAS pin is left floating if  
this feature is not used.  
SYNC  
This pin provides the synchronization input.  
5 (CS51412/ 14)  
4 (CS51411/ 13)  
SHDNB  
The shutdown pin is active low and TTL compatible. The IC goes into  
sleep mode, drawing less than 85µA when the pin voltage is pulled  
below 1V. This pin should be left floating in normal operation.  
6
7
Gnd  
VFB  
Power return connection for the IC.  
The FB pin provides input to the inverting input of the error amplifier. If  
VFB is lower than 0.29V, the oscillator frequency is divided by four, and  
current limit folds back to about 1 ampere. These features protect the IC  
under severe overcurrent or short circuit conditions.  
8
VC  
The VC pin provides a connection point to the output of the error amplifi-  
er and input to the PWM comparator. Driving of this pin should be  
avoided because on-chip test circuitry becomes active whenever current  
exceeding 0.5mA is forced into the IC.  
Block Diagram  
SHDNB  
SYNC  
VIN  
5µA  
Shutdown  
Comparator  
2.9V  
LDO Voltage  
Regulator  
+
Thermal  
Shutdown  
Artificial  
Ramp  
Oscillator  
BIAS  
BOOST  
-
+
-
1.3V  
Output  
Driver  
S
R
Q
VSW  
+
-
Current  
Limit  
Comparator  
PWM  
Comparator  
IREF  
+
1.46V  
-
-
-
V
+
FB  
IFOLDBACK  
+
Frequency  
and Current  
Limit Foldback  
+
Gnd  
0.32V  
-
+
-
Error  
1.270V  
Amplifier  
VC  
4
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